Electric bell.



APPLICATION FILED MAR. l. 1906.

PATENTED MAR. 10, 1908.

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striker and bell are mounted entirely outside UNITED DONALD M. BLISS,

' ELECTRIC BELL;

Specification of Letters Patent.

OF NEW YORK, N. Y.

Patented March 10, 1908.

Application filed Marci. 1, 1906. Serial No. 803,620.

To all whom it may concern: 1 Be it known that I, DONALD M. Buss, a 1subject of the King of Great Britain, residing in New York, county andState of New 1 York, have invented an Improvement in Electric Bells, ofwhich the following description, in connection'with the accompany--ing-drawings, is a specification, like letters on the drawingsrepresenting like parts. The resent invention relates to an electricbell and is embodied in a bellfor outdoor use, the purpose being toinclose the windings, contacts, &c.,which are liable to be injured .1 byexposure to weather, in a water-tight case. This is accomplished inaccordance with the invention without 'inclosing the striker, so thatthe-latter can come into direct contact with the bell, the action notbeing interfered with by any inclosing i member interposed between thestriker and g the bell, there bein at the same time, no opening for thestri er through the case to admit moisture. 1

In accordance with the invention, the

of the casing, the striker being connected with an armature which is inthe magnetic field of an electro-magnet contained within the casing,while the polar extremities of said electro magnet project through thewall of the casing to the outside thereof, this part of the wall beingof non-magnetic substance.

In order to make and break the circuit to produce the vibration of thestriker armature, the instrument is provided in the interior of thecasing with a supplemental electroi magnet controlling a circuitinterrupter, the contactsof which are within the casing; l

The drawing is a vertical section, partly in'elevation, through thewalls of the cas- 1 ing, showing the operating parts mainly in The bella is shown as sup orted on 'a' pro--: jection c from one wall of t ecasing e, the 3 bell being operated u on by the striker b which is alsomountei outside the casing", being hereinshown as supported. upon thespring member I) secured at b to the outer 5 wall of the facing c. i V IIn order to cover and rotect, to a certain extent, the striker I) am.the parts where it i is connected to the casi g? upplemental hood 1)maybe secured to the outer wall of the casing,*this hood also beingshown as the casing c, Whi

Q ing bell.

justing stop If. The striker b has connected therewith an armature 1)"-which stands in the magnetic field of an electro magnet d, the

coils and windings of which are inclosed in e the pole pieces (1 projectthrough the wall of the casing, being tightly fitted in said wall so asto render the casing .moisture-proofi In order to produce ,the vibrationof the strikenb and consequent operation of the bell, it is necessaryto'provide the instrument with a circuit interru ter, and in order thatsaid interrupter may e inclosed in the case andv be fullyprotected, theinstrument is provided with a supplemental electro magnet e to influencethe armature f of ,the circuit interrupter, which consists of themovable contact f 2 and fixed contact f". The

fixed contact f is connected by means of a conductor 2 with the bindingpost 3 inside the casing, the said binding post having electricalconnection-with'the conductor A of the main circuit.

The main circ it conductors A and B are shown as led .ito the casing 0through a stuffing box C,-and the conductor B is con nected with thebinding post 5.

The movable contact f is shown as a spring electrically connected with ametallic sup orting member f which is connected Wit a conductor 4 whichincludes the coils of the magnet e and the coils of the magnet d inseries, and is connected with the binding post 5 and conductor B of themain circuit. he armature f is rovidedwith an adjustable weight whictends to hold it in such a position that the fixed and movable contactsz and f are in electrical engagement. If, therefore, the current isturned on, a circuit-is closed through both electro magnets (land e,attracting the armature b to strike the gong a, and the armaturef tobreak the circuit. The circuit being thus broken, thearmature f returnsto its original position again (closing the circuit, the instrumentoperating after the usual manner of, a vibrat- By the employment of thead'usting weight f, the period of vibration of armaturefmay be broughtinto unison with that of the armature b, sov that the two armatures willvibrate together.

What'I claim is:

' An electric vibrator bell comprising a gong a' striker therefor; an-armature con- 55 affording a support for the armature ad: inected withsaid striker; an electro-magnet '1 o [0 cooperate with said armature; a.waterstuffing box for said leading-in wires to ren- 10 tight inelosingease for the windings of said der the case completely water-tight.electro-magnet, the polar extremities of said In testimony whereof, Ihave signed my eleetro-magnet projecting through the wall Il11110 tothis specification in the presence of a of said case; av circuitinterrupter contained two subscribing witnesses.

in said case and consisting of an electro- DONALD M. BLISS. ma net anda. c-ircuit-controlling armature; Witnesses: lea ing-in wires to supplythe circuit through W. E. COVENEY,

the electro-magnets inside the case; and a i H. J. LIVERMORE.

